Who said "Leadership in war demands both intellect and iron will."?

This quote is attributed to Douglas Haig.

Leadership in war demands both intellect and iron will. - Douglas Haig

"Leadership in war demands both intellect and iron will."

Douglas Haig Leadership

Military Field Marshal British 1861–1928

"I have not the smallest doubt that the credit of this war will eventually rest with the cavalry."

"The general who loses morale loses the battle."

"In any war, the morale of the troops is half the battle."

"Success in war depends upon the moral factor."

"A leader must be fair and just."

"Integrity is everything."

"One must take responsibility for one's environment."

"In this house, I make the decisions"